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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cbdb65814d717865f0cc7c111e2a252ac3f22db32474a1a537ff82a30dfb52' 
  AND token = 'gGBkENnu6zNH4gAcfaxh33h85yUiHZ04iq7QGBl7MHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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