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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acef23f5ef6c4d9f33abe0565f158ef68ff9853ecc1a26f2530c1d2dab96aa8' 
  AND token = 'b+dz+zIZeYZOB4z5pDwImEEe4GLGB0hNzo8jfrTSWxU=' 
  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"
    }
  }
}