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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6293d315f3737bf254f57409cc203abfe44ccfbe7b32d42c95d3ab7f11b4a558' 
  AND token = 'e3mqqfL9BQzT6vWItAqSSRpczn4TY4jvrMUTygrLe+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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