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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8abe5ce5ab3eb7812e8829dd1c31a02d65699e3d429710fd62b82e189975e5' 
  AND token = 'DNEQJMDgwgLRhUhIOp79X6DfTYsASy9aPku8pcq0bT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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