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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202bab1775f18f592b3808aff1b8f87046d05e8e17a2e47a3cf44a67f2a208b5' 
  AND token = 'LO9Uv8Rj2D6lSox5JTHMXgmxuQrw9j01PRscmaAOW6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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