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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758bf7ae6f3c74f2e9d3511e58863ba67287301a84db1be85058534ee281eae4' 
  AND token = 'gKmXCor9RLWlvS5QpB3lCkC1FCPK8KDGWuPTl7PLCKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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