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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d28e7a1d4bcb95cff89d0e0ba42fda9a3f90c641c6a1983dbdfedb5bd31f2a' 
  AND token = '0U6zf2nJiFaTkph1isdczsxLarRe7UjIa2d/oa/3/H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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