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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519b478e8ac2ce1e34c1f4f7b5f8e98ecac5be2d415f0f73a2189d10a3ef6e88' 
  AND token = '1XS4XC2lBigOAq4Mdj5piYL6j267LkOXkV0gqzQR2qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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