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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f0f02bf369c11ff0a09022b2bbb60e1d2399d2235be3933d5e2add67a849ff' 
  AND token = 'Vm1cEisrA/ifauDfT8QKgckMvRNANHCx6jrbJcNvrSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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