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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85f0bcab6a77840fa0e126c115b5f2dbd141c07030b0b1eae37e574ab325a9b' 
  AND token = 'pg+i+dgnDShrlsLze3+zeBmEDPAIDlN8pvwPLYj7fXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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