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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7b85835022cf8b529a17f69d6ff8af345e411e01e47f31323522e5b475451d' 
  AND token = 'BewaYbz3qnBFuF7TRXm2xe296ww6J3AX3U2mztHhF+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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