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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087039aa93c9fa3a099a72d815736ac9346cc2b5e776a08c2714b6bc32e73a22' 
  AND token = 'sD1QmB3EL8TMuEyakTDHP4lN/oxXsYSSC+xQ+9+vSC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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