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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2355b4d95c9d4b07b34f13e26da2fe8ad58c022413d3ec82a398187b53f88ad' 
  AND token = 'ra1j3BHn2vyu17jQEWw1eFFivALRLZFN79qL9PYcScY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}