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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b78a5507943e8410f7c3af5c5f10f0ac042f82d9143ef4c01e1b108abad246' 
  AND token = '70sUMh6apBoCEX8Wznn4jYR1Yj81+jRv5kX/Vpdmsr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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