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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e7efeb1189bd706464a7d637d828f32bd62658d94a26ac0951502764d5da87' 
  AND token = 'q6Gb5mdZ7wolLp/kwnUy1tfS7tMpWs18s+mW9rtDwzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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