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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10a9a24fe47c70d69cd1b3f3a77ca1ec3a865c4d677a4cad2baf65592eb7c42' 
  AND token = 'elKL7N3R9UKXSZbd0ozNN9M/GmtM2Nh86yAMcF13Adg=' 
  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"
    }
  }
}