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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89efc29a771f28d3edf58e57ebc2ee4212c1aedb8387d4a603be15c95cdde088' 
  AND token = 'bLK5pUrwQqbQ0R5mPVrlxDtDB/wsJ0vYqKgXw06mQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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