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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baa346d25ac27f13520bae58a6284ac5e27fe4e31959a28399d5fe9569ba4a3' 
  AND token = 'A+kSj/YrHnrdr4WNU/qbrDySuMZrmP2V2b1dhF/rcGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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