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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f8e02906e3a15e5d478111f02e03af623feef7c74a1cfd98d339a31dd792a7' 
  AND token = 'NMxElyMHGHaip7GN7YAoBMAg5PBEbZClMhOa0yVmU2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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