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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b52d393a2341261e0dd166dc5bea6211f277e3673877af2b75a4c2e8252d4e' 
  AND token = 'ITshXqq4VMhaG4tNk412twZzCqHj7VBKeET4+Fo9aeI=' 
  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"
    }
  }
}