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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68316eaf2fd106b93669db5fcb326f3d646134b1c8621b6625a7f29b9e3808f7' 
  AND token = 'yLbjMoHSd945bIX2gnUrgP5pAmMEO0psuqN2d0ivkbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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