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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec97ef0d0e3d22dfd6bf442572a304bf37bd188df1876cb9de2203d17606be76' 
  AND token = '7DSQhGPxFKMUIDaU6RwqasjZhhre9Q03RqVl4E4Bsg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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