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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20a88277ec73cfde6b3a4034d0459a6c9e9ae0bd2b491a59604435c9645e97d' 
  AND token = 'u3OoCctP/g5XZJAl0Y7hlkZ7GgSUAN+L7+EZAoQoncU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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