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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9026fbf0f7ee18660f88d5aedf99d457a92ca0166bd9b8c162fc893a28a1a595' 
  AND token = 'gFIF9vn6Ze+umf5RmRBiD9M/2I5zOvIZ0fwc2ud9gU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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