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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dc2ac00622f1b7be0a8c80ffefc6bfa317f94bfd638f3fcdf7c4dcaafa1716' 
  AND token = 'gbGdgY50WwomNZDe/X4EH2A1DqrTuNy6adperarXFmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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