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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22da7a0bb416432ab443e2c1488c0731c558c8b4554e2b5ffbc36dd187a7d3cf' 
  AND token = 'bs1O/Pkb70LXRnc9E/H3+mFv7iHbGg3kpw+kO0pdt98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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