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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccbfc7f93a5babff1bd80914f481a815205b9d12f6ffa4917abeb23eec2fa67' 
  AND token = '4LVNMGubJOTAA03fyogzSCF0FU2UB2qr/eadZKw0gBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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