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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0bfc332b5648a28b2c8553eabd20f97d03c73fa0eafd43c731086d65c83f55' 
  AND token = 't1t5yWnb3j/zpOpMmjNAdRRFJzuTkjup69alDWq53uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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