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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac88fbbef6d5346d2c840443db4a6b9af584c04f6daaa9d0f3a567aa771f9e2' 
  AND token = '+HNlqm3k+iGmMAfNeHbH6MOOVVrUcVuz3owH3I0gAqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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