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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626031634916365caa42076d6d85086eccb77a8645f8876c7e5d0b5b90b6cec0' 
  AND token = 'kzMw9W+ZMrGjj/SBSOMUWn5phMyeiO0gEpr1BDDQFB8=' 
  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"
    }
  }
}