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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a0ea812a3bc9691112fd5e0cdf4589a8279d6d9e9f89c0a159f2fa05bf4bbb' 
  AND token = 'krhmvbu9b4DyHQ9Vo3+V4gbbYq2UDXsn2TWxY2JhaVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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