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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee68b4db9b081745da9c515d83c2485279d3f18d83962a45e38c388898e3fcd' 
  AND token = 'JyRpSbMTRcgNaE+C9IkA4VB9fEiYX1Ud/wA58OGA20M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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