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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9878a86d47337cb556d4673eb5b037fbb59023c531f3db9a5fced0bc49af74b' 
  AND token = 'cHH7bxY/Z86AGx0j2Z8TkmPsLQ3JOEyAi1qr27caZ1g=' 
  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"
    }
  }
}