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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8caab674bfe80e948a1d54433922674611dad4b4ada705eac76e4260b0f5c4e' 
  AND token = 'GkIXCSxRQSP4pqo9XYCTiSVZwsOEF7mleTY5bagd16w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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