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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3cc732ab55a18b3bf03456002365d6b7e326416023b5091107b6a90befe7bf' 
  AND token = 'vBp4Gt5X94BeXicDwo+N4uXSLajt63vDnwBgECN6T3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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