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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1e17c8f3fa9ab1183034d23f2598eccfa8582dbb69ade0dfd94db3a9556c3a' 
  AND token = 'v9PtgHyGeTJhsN8Fm5ZLeD+Z3cwC1PLSgd4N/jNZ/TM=' 
  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"
    }
  }
}