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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32709fd61fb4345f85dbb84ac028b6d2b744ffa012d9745356ed2f5d3e6b7a75' 
  AND token = '6IkwmuZKmTN/XPSFmsB7OoHoH/IPNr4Y7K5To0dcnJA=' 
  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"
    }
  }
}