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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79097ca3b1064a3e83a8a2a79464cddd2c3562dda1a5805d0e882f9179444767' 
  AND token = 'Y7ggKQM5t/PEEm6xN5h9ezLLeN6O/+nwHJRVTEMuBAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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