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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010d8d14c68db461fbfadbac56be465234bd35e74847e44613f50b6399a28ea0' 
  AND token = 'c401D3jgvBSNscNmGEh9J4c/6HSlkum1TCFY5q0V+80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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